Lock nut



FIG. 1 is a front elevational view of a lock nut showing my new design; the rear being identical;

FIG. 2 is a side elevational view view thereof, not sides being identical;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a sectional view taken in the direction of the arrows on line 5--5 of FIG. 1; and,

FIG. 6 is a sectional view taken in the direction of the arrows on line 6--6 of FIG. 2. 

The ornamental design for a lock nut, as shown and described. 